Add http://download.eclipse.org/reddeer/releases/2.9.0 so that this
requirement resolves:

requires 'osgi.bundle; org.eclipse.reddeer.core [2.1.0,3.0.0)'

Change-Id: I2d1a23fb70c8a1b81f7f9e55e653d97a8d58b4c8
Signed-off-by: Ed Merks <ed.merks@gmail.com>